Search found 11 matches
- Mon Aug 06, 2018 11:48 am
- Forum: OLED128 Display
- Topic: SdFat instead of SD library?
- Replies: 0
- Views: 10928
SdFat instead of SD library?
So far I have only used the SD library to get .BMPs from an SD card. Has anyone tried the SdFat library instead? Anecdotes online (e.g https://github.com/greiman/SdFat-beta/issues/2) say it's faster...
- Wed Dec 06, 2017 4:31 am
- Forum: Dot Matrix Display
- Topic: Pong
- Replies: 3
- Views: 15186
Re: Pong
Digging up an old thread here... I just wanted to add that you need to use pullup/pulldown resistors (or enable the built-in pullups in your code) so that you don't get spurious movements of the players' paddles. Something like pinMode(P1_UP_PIN, INPUT_PULLUP); pinMode(P2_UP_PIN, INPUT_PULLUP); // a...
- Thu Oct 26, 2017 12:59 pm
- Forum: OLED128 Display
- Topic: writing .BMPs from SD to internal memory
- Replies: 1
- Views: 3950
Re: writing .BMPs from SD to internal memory
Replying to my own post - another option would be to take advantage of the SAMD21's extra RAM and read each image from the SD card into RAM, then dumping the whole thing onto the screen. I think the current driver does it line by line, which might explain why it's a bit slow. And kudos to the Freetr...
- Sun Oct 22, 2017 10:56 am
- Forum: OLED128 Display
- Topic: writing .BMPs from SD to internal memory
- Replies: 1
- Views: 3950
writing .BMPs from SD to internal memory
Hi all, I'm trying to speed up the screen updates when writing BMPs (aren't we all!). I'm using a Sparkfun SAMD21 mini. It's an ARM M0 core, which I think is roughly the same as an Arduino Zero. The main benefit in this situation is that it has 256kB of program memory, so it should be able to hold t...
- Wed Oct 18, 2017 11:53 pm
- Forum: OLED128 Display
- Topic: Newbie question - do I draw each frame
- Replies: 1
- Views: 3573
Re: Newbie question - do I draw each frame
Try it! You won't break anything. If you have an oscilloscope you could set a pin high at the start of a drawing operation and then low at the end. Use your oscilloscope to measure the duration... because you can't always trust your eyes :-) Alternatively you could use a technique like at https://st...
- Wed Oct 11, 2017 8:46 am
- Forum: OLED128 Display
- Topic: OLED128 movie cameo
- Replies: 0
- Views: 3342
OLED128 movie cameo
According to Jeremy at Jaycar in Bondi Junction, they used to sell a lot of these screens to Fox Studios. Apparently the screens were used in props or sets for the most recent Alien movie... Has anyone seen the film and can confirm?
- Sun Sep 10, 2017 7:14 am
- Forum: OLED128 Display
- Topic: Any issues running it off 3.3V?
- Replies: 0
- Views: 3430
Any issues running it off 3.3V?
According to the product page, this board will run off 3.3v. Has anyone tried it? Are there any pitfalls I should be aware of?
Thanks!
Thanks!
- Sat Dec 10, 2016 7:56 pm
- Forum: OLED128 Display
- Topic: corrupted display - signal noise?
- Replies: 2
- Views: 7351
Re: corrupted display - signal noise?
After some more testing, it looks like I was having a problem with using up RAM. I was using the example code to display a .BMP. It looks like the issue is with this part: BMP_Status result = oled.displayBMP(image, 0, 0); if(result != BMP_OK) { Serial.print("Error loading BMP "); Serial.println((int...
- Sun Oct 09, 2016 11:17 am
- Forum: OLED128 Display
- Topic: Wiring to Bluz
- Replies: 2
- Views: 7379
Re: Wiring to Bluz
I think I understand what you mean - using the ICSP port is the same as wiring to PINs. The ICSP port on Arduinos is connected directly to the normal pins on the Arduino and they share the SPI bus. Have a look at the schematic at https://www.arduino.cc/en/uploads/Main/arduino-uno-schematic.pdf to sh...
- Thu Oct 06, 2016 9:03 pm
- Forum: OLED128 Display
- Topic: corrupted display - signal noise?
- Replies: 2
- Views: 7351
Re: corrupted display - signal noise?
Nobody has ever seen this problem before? Any suggestions? I can't see any pattern to the issue - the number of frames I get before the image corruption and eventual freezing doesn't seem consistent. I'll try sending simple data straight from the arduino to the screen, to see if taking the SD card r...